Chalcopyrite ore beneficiation process and method

a technology of chalcopyrite and beneficiation process, which is applied in the direction of flotation, solid separation, grain treatment, etc., can solve the problems of difficult to obtain a steady metallurgical performance, adverse to the sequential tailing treatment and the environment, and extremely toxic sodium cyanide reagents, etc., to reduce the consumption of reagents, reduce the influence, and reduce the influence

Inactive Publication Date: 2016-06-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Benefits of technology

[0008]In the present invention which adopts the above technical scheme, size grading not only reduces the influence of talc, pyrite and pyrrhotite on chalcopyrite ore containing pyrrhotite, talc and serpentine, but also reduces the influence of fine size fraction mineral on coarse mineral, and reduces the consumption of reagents. In the flotation of coarse chalcopyrite ore containing pyrrhotite, talc and serpentine, CMC is added to depress talc, and calcium oxide is used to control the pH and to depress pyrite and pyrrhotite. Without any influence from the fine particles, high grade copper concentrate can be obtained consequently. The separation of fine-sized chalcopyrite from pyrite, pyrrhotite and talc remains an issue. Merely using CMC to depress talc, calcium oxide to control the pH and to depress pyrite and pyrrhotite, and xanthate to collect chalcopyrite, the metallurgical performance of chalcopyrite is not efficient at all. In order to achieve effective selective separation of fine chalcopyrite, preconcentration is conducted using hydrocarbon oil collector such as kerosene or diesel oil on the rougher concentrate to separate chalcopyrite from pyrite and pyrrhotite, in which case the influence of pyrite and pyrrhotite on the flotation process is reduced, thereafter conducting cleaner on the preconcentration concentrate using CMC to depress talc and calcium oxide to control the pH and depress pyrite and pyrrhotite. In the present invention, ores are divided into fine size fraction and coarse size fraction by means of size grading and are processed separately. Flotation separation of such refractory chalcopyrite ore can be achieved by treating ores with conventional sulfide collectors and depressors, and treating ores in fine size fraction with kerosene and diesel oil, employed as collector either alone or in combination with each other. Therefore, the cost of flotation reagents is cut down greatly. In the case that the chalcopyrite ore is free of pyrrhotite, talc and serpentine, this process will not influence the final metallurgical performance. Therefore, the present process can realize the flotation separation of chalcopyrite from multiple natural types of chalcopyrite ores containing pyrrhotite, talc and serpentine.

Problems solved by technology

However, sodium cyanide is an extremely toxic reagent, the application of which will be detrimental to the sequential tailing treatment and the environment.
The processes have three disadvantages as follows: Firstly, although online analysis and inspection system are adopted in the flotation circuits, there is a certain lag between the changes occurred in differential separation processes, additionally, the separation processes often fail to reach steady state in time, causing it hard to obtain a steady metallurgical performance, both of which lead to lower separation efficiency and greater copper losses especially when changes in ores type are frequent.
Secondly, talc exhibits excellent floatability, therefore increasing talc pre-flotation can effectively reduce the content of silicon and magnesium in the copper concentrate, whereas chalcopyrite is also readily floatable, and a portion of chalcopyrite is floated into the talc concentrate during the talc pre-flotation, which causes copper losses and lowers the recovery of chalcopyrite.
Thirdly, even though the highly selective collector or combined depressor is employed, the metallurgical performance is still not very satisfactory, and the cost of flotation reagents is remarkably high.

Method used

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Examples

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Effect test

example 1

[0011]Primary materials of the present invention: copper ore from Dongguashan, calcium oxide, CMC, sodium ethylxanthate, kerosere, pine camphor oil.

[0012]The chalcopyrite primary ore used in the present invention mainly contained 0.94% Cu, 23.20% TFe, 14.38% S, 3.9% MgO, 28.03% SiO2, and the principal mineralogical composition were sulfide minerals (including 24.75% pyrhotite, 10.71% pyrite, 3.07% chalcopyrite, 0.01% galena, etc), 8.07% iron oxide (mainly comprising magnetite), and gangue mineral (consisting predominantly of 7.49% quartz, 4.34% feldspar, 1.5% talc and 6.22% carbonate, etc). The dissemination of chalcopyrite and pyrrhotite was relatively fine in the ore, whereas pyrite was mainly disseminated in the coarse fraction, and the relationship amongst the dissemination of these three minerals was very complex, so that optimum liberation was seldom achieved, which has significant impact on grinding stage and the sequential floating circuits.

Step One: Size Grading

[0013]The cr...

example 2

[0018]The operations were similar to those in example 1. The reagent amounts and mixing time of each operation are shown in Table 2 below.

TABLE 2CaOCMCXanthatePine camphor oilmixingmixingmixingmixingNumericalpHtimeamounttimeamounttimeamounttimeordervalue(min)(g · t−1)(min)(g · t−1)(min)(g · t−1)(min)111.42752752221211.52372372111311.5225225271911.927027522411011.926527022011111.923523721211211.9223225281KeroseneDiesel oilPine camphor oil——mixingmixingmixing——amounttimeamounttimeamounttime(g · t−1)(min)(g · t−1)(min)(g · t−1)(min)4402——101——5402——81——6202——51——7132——31——

[0019]After the flotation, copper concentrates (combining copper concentrate I and copper concentrate II) grading 21.12% Cu was obtained at recovery and yield of 91.3% and 3.89% respectively.

example 3

[0020]The operations were similar to those in example 1 with the exception that diesel oil was used as collector in the step (3) fine-grain flotation circuits.

[0021]The reagent amounts and mixing time of each operation are shown in Table 3 below.

TABLE 3CaOCMCXanthatePine camphor oilmixingmixingmixingmixingNumericalpHtimeamounttimeamounttimeamounttimeordervalue(min)(g · t−1)(min)(g · t−1)(min)(g · t−1)(min)111.62702752241211.52352372121311.5224225281912.026026022411011.926026522011111.823023021211211.8220220281KeroseneDiesel oilPine camphor oilmixingmixingmixingamounttimeamounttimeamounttime(g · t−1)(min)(g · t−1)(min)(g · t−1)(min)4——382915——382916——192417——12231

[0022]After the flotation, copper concentrates (combining copper concentrate I and copper concentrate II) grading 21.03% Cu was obtained at recovery and yield of 90.42% and 4.12% respectively.

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Abstract

The present invention relates to a mineral processing technology and method for refractory chalcopyrite ores, particularly to a mineral processing technology and method for the separation of chalcopyrite from multiple natural types of copper ores containing chalcopyrite, pyrrhotite, talc and serpentine, which belongs to the technical field of mineral processing. It's characterized by: conducting a two-stage grinding on the chalcopyrite ore, with each grinding stage followed by size grading, and treating ores in different size fractions separately, wherein coarse-grain ores are separated in the presence of xanthate, with calcium oxide and CMC controlling the pH and acting as depressor respectively, while fine-grained ores are subjected to rougher in the presence of kerosene, and subsequently subjected to cleaner in the presence of xanthate.

Description

TECHNICAL FIELD[0001]The present invention relates to the field of mineral processing technology, and particularly to a method and process for separating chalcopyrite from talc, pyrite and pyrrhotite by flotation.BACKGROUND OF THE INVENTION[0002]Copper is an extremely important metal material in the national economic construction. With the rapid development of national economy, the copper resources which are easy to separate are getting increasingly scarce, more and more attention has been paid to the development and utilization of refractory copper resources. With the aim of realizing the efficient development and utilization of refractory chalcopyrite resources, extensive studies have been conducted by a number of research units and institutes. CN Pat. App. No. 200710180591.5 discloses a method for flotation separation of copper-sulfur, in which copper-sulfur separation of bulk concentrate is achieved at a pH of between 12.5 and 13, with the addition of combined depressor includin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B03D1/02B02C23/14
CPCB03D1/02B03D2203/02B02C23/14
Inventor BAI, LIMEIHAN, YUEXINYUAN, ZHITAOMA, YUXINLIU, GUOZHENLI, MENGZHAO, LIBINGNIU, FUSHENGZHANG, JINXIA
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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